Senior Environmental Scientist III

Apex Companies; Fullerton (CA); On-site; USD 83,000 - 125,000; Full time

Job summary

Apex Companies is seeking a Senior Environmental Scientist III in Fullerton, California, to assist clients with stormwater planning and ensure regulatory compliance. Responsibilities include leading environmental sampling and preparing detailed technical reports.

The ideal candidate holds a BS in Environmental Science or Engineering and has over 5 years of professional experience. You will be expected to have certifications like CPSWQ or CPESC and proficiency in Microsoft Office and ArcGIS, with an expected annual salary range of $83,000 – $125,000.

Qualifications

• 5+ years of professional work experience in environmental science or engineering.
• Knowledge of stormwater planning and permitting.
• Certified Professional in Surface Water Quality (CPSWQ) or CPESC required.

Responsibilities

• Assist clients with stormwater planning and compliance.
• Prepare technical reports and conduct environmental inspections.
• Lead environmental sampling and testing.

Skills

Stormwater permitting

Environmental compliance inspections

Regulatory interpretation

Data management and analysis

Microsoft Office Suite

Education

BS in Environmental Science, Civil or Environmental Engineering

MS or PhD in related field

Tools

ArcGIS

HAZWOPER training

Job description

Senior Environmental Scientist III

Location: Fullerton, California.

Responsibilities include:

• Assist municipal, utility, industrial, and commercial clients with stormwater planning and compliance for Phase I and II MS4 permits, CGP, and IGP.
• Interpret complex regulatory permits and provide regulatory compliance strategies.
• Prepare technical reports, conduct environmental compliance inspections and sampling, and deliver high‑quality deliverables on time and within budget.
• Lead environmental sampling, testing, and observations (surface water, stormwater, groundwater, wastewater, soils, and sediments).
• Execute/manage field investigations and conduct site inspections (QSP, QISP, FOG).
• Develop and implement monitoring and reporting plans and field studies.
• Perform data management and analysis, including regulatory and water quality analyses.
• Prepare and monitor project budgets and manage workload of other Environmental Scientist staff.
• Meet with clients about work and performance, and discuss current and future projects.
• Participate in or lead technical presentations.

Required Competencies and Qualifications

• BS in Environmental Science, Civil or Environmental Engineering, or a related field.
• 5+ years of professional work experience.
• Knowledge of stormwater permitting and planning, water quality monitoring, BMPs, and environmental compliance inspections.
• Certified Professional in Surface Water Quality (CPSWQ) or Certified Professional Environmental Safety and Compliance (CPESC).
• QSD or QSP and QISP certifications.
• Ability to read, interpret, and analyze plans, technical manuals, and permits.
• Strong analytical skills, excellent written and verbal communication, and high attention to detail.
• Strong work ethic, proactive, self‑starter, positive attitude, and team player.
• Proficient in Microsoft Office Suite.
• Physical ability to kneel, climb, and lift up to 50 lbs.
• Valid California driver’s license and insurable driving record.

Desired Competencies and Qualifications

• MS or PhD in Environmental Science, Civil or Environmental Engineering, or a related field.
• Proficiency with ArcGIS.
• OSHA 40‑hour HAZWOPER training.
• Experience performing maintenance and calibration of environmental monitoring instruments, meters, probes, and automated sampling equipment.

Annual Expected Pay Range

$83,000 – $125,000 USD

Equal Opportunity Employer

We believe in equality for all and celebrate the diversity and differences of our employees, customers, and communities. We do not discriminate based on gender, race or color, ethnicity or national origin, age, disability, religion, sexual orientation, gender identity or expression, veteran status, or any other applicable characteristics protected by law. Please contact us if you require accommodations during the application process.